112-5109E 12.7 mm Dia. x -50 mm FL; Uncoated; Plano-Concave Lens

The 112-5109E is a plano-concave lens with a diameter of 12.7 mm and a focal length of -50 mm, making it a negatively powered lens. This lens is sourced from EKSMA Optics, a reputable vendor in the optical components industry. The lens's geometry includes a thickness edge of 3 mm and a thickness center of 2 mm, indicating a slight curvature. The lens is uncoated, which means it does not have any additional layers to protect it from environmental factors or enhance its optical properties.

The lens is made of CAF2 (Calcium Fluoride) material, which is known for its excellent transparency in the ultraviolet, visible, and near-infrared regions of the spectrum. The material ID is "caf2 mal-1963", suggesting that this particular CAF2 variant is manufactured by Meller Optics, a company known for its high-quality optical materials. The lens is designed to operate at a wavelength of 2940 nm, making it suitable for applications in the near-infrared spectrum.

This lens is a spherical lens, meaning it has a constant curvature throughout its surface. The inner and outer radii are both 0, indicating that the lens is plano-concave, with one flat surface and one curved surface. The curvature of the lens is defined by a radius of -20.9 mm, which is the radius of the curved surface.